Description

4-Isocyanato-5-Methyl-1-Phenyl-1H-Pyrazole is a specialized heterocyclic isocyanate building block of significant interest in advanced organic synthesis. This compound matters for its role as a key precursor in the development of novel pharmaceuticals, agrochemicals, and functional materials, enabling the formation of ureas and carbamates with high efficiency. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, crop protection, and specialty chemical industries for constructing complex molecular architectures.

Application

• Pharmaceutical Intermediate: A critical building block for the synthesis of active pharmaceutical ingredients (APIs), particularly in the development of kinase inhibitors and other targeted therapies.
• Agrochemical Synthesis: Used in the research and production of novel herbicides, fungicides, and insecticides, where the pyrazole-isocyanate moiety confers specific biological activity.
• Polymer & Material Science: Serves as a monomer or cross-linking agent in the production of specialty polyurethanes, coatings, and adhesives with enhanced performance characteristics.
• Chemical Biology & Proteomics: Employed as a reactive handle for bioconjugation, labeling biomolecules, or developing activity-based probes for enzyme studies.
• Organic Synthesis Reagent: Utilized in academic and industrial research for constructing complex heterocycles and as a versatile isocyanate component in multicomponent reactions.

Basic Information

Product Name	4-Isocyanato-5-Methyl-1-Phenyl-1H-Pyrazole
CAS No.	799283-97-9
Molecular Formula	C11H9N3O
Molecular Weight	199.21 g/mol
Synonyms	1-Phenyl-5-methyl-1H-pyrazole-4-isocyanate; 5-Methyl-1-phenyl-1H-pyrazole-4-isocyanate; 4-Isocyanato-5-methyl-1-phenylpyrazole; 1H-Pyrazole-4-isocyanate, 5-methyl-1-phenyl-; 5-Methyl-1-phenyl-4-isocyanatopyrazole; Pyrazole-4-isocyanate derivative; NSC 799283; CAS 799283-97-9
EINECS	Contact for details

Quality Control

Our 4-Isocyanato-5-Methyl-1-Phenyl-1H-Pyrazole is produced under strict quality management protocols to ensure batch-to-batch consistency and high purity. All products undergo rigorous analytical testing, including HPLC, NMR, and IR spectroscopy, to confirm identity and purity. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with each shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent degradation from moisture. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Melting Point	Contact for details
Water Content (KF)	≤ 0.5%
Heavy Metals	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.